Update UPGRADING.md (#13010)

Add missing `import dom` and `dom.watch()`

diff --git a/UPGRADING.md b/UPGRADING.md
index ab4a952c4f13dffba11e8a90d916d99d508e5631..64cb1af5a379057422b643e35c8dd8e63402f546 100644 (file)
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -72,12 +72,14 @@ import fontaweome.library.add(solid, faTwitter)
 New way:
 
 ```javascript
-import { library } from '@fontawesome/fontawesome-svg-core'
+import { library, dom } from '@fontawesome/fontawesome-svg-core'
 import { fas } from '@fortawesome/free-solid-svg-icons'
 import { faTwitter } from '@fortawesome/free-brands-svg-icons'
 import { FontAwesomeIcon } from '@fortawesome/vue-fontawesome'
 
 import library.add(fas, faTwitter)
+
+dom.watch()
 ```
 
 This is also a valid way to import icons that works if your tool does not support tree shaking: